<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>盒子阴影</title>
    <style type="text/css">
        #box1{
            width: 200px;
            height: 100px;
            background-color: forestgreen;
            box-shadow: 10px 10px 5px lightgrey;
        }
        p{
            color: white;
        }
    </style>
</head>
<body>
  <div id="box1">
      <p>盒子阴影</p>
  </div>
</body>
</html>